Everbuild P14 is a multi-purpose central heating inhibitor that protects your system from scale, sludge and corrosion. Suitable for all system types including sealed and open-vented, it keeps heat output consistent and extends boiler life.
The Everbuild P14 Central Heating System Inhibitor is a straightforward, effective treatment for protecting domestic and light commercial central heating systems. One litre treats a standard system, guarding against the three main causes of heating inefficiency: scale, sludge and corrosion. If you’ve ever had to power-flush a system that’s been left untreated for a few years, you’ll know exactly why this stuff matters.
Scale builds up on heat exchanger surfaces and restricts flow. Sludge settles in radiators and creates cold spots. Corrosion quietly attacks pipework and boiler components until something fails. The everbuild p14 heating system inhibitor addresses all three in a single treatment, which is why it’s a standard addition for heating engineers during annual servicing or after any system work.
Where Everbuild P14 Gets Used
This inhibitor is compatible with all common central heating system configurations: sealed systems, open-vented systems, and combi boiler setups. It works with steel, copper, aluminium and plastic pipework, so there are no awkward compatibility questions on mixed systems. It’s also suitable for use with underfloor heating circuits, which are particularly vulnerable to sludge accumulation due to lower flow temperatures and longer pipe runs.
Installers typically dose a fresh system during commissioning, and heating engineers add it after a power flush or when replacing a boiler. Landlords and property managers also keep it on hand for annual maintenance visits. At this price per litre, there’s no sensible reason to leave a system unprotected.
Long-Term System Protection
Central heating systems that are properly inhibited last significantly longer between major interventions. Boiler manufacturers often require evidence of inhibitor treatment to honour warranty claims, so dosing isn’t just good practice, it’s sometimes a contractual necessity. The P14 formula is compatible with most commercially available central heating additives and leak sealers, so it fits into most treatment programmes without conflict.
Pro Tip: After dosing, check the inhibitor concentration with a test strip at the next service visit, as systems with frequent top-ups can become diluted over time and lose protection before the annual service date.
Everbuild P14 is used during boiler installation, system commissioning, post-power-flush re-dosing, and routine annual servicing. It suits domestic properties, HMOs, small commercial premises, and any building with a wet central heating circuit. Heating engineers, gas safe installers and plumbers reach for it as a matter of course. It works across sealed and open-vented systems and is equally at home in underfloor heating setups where sludge accumulation can be a persistent problem.
Best For
Annual system servicing
New system commissioning
Post power flush re-dosing
Boiler replacement work
Underfloor heating circuits
Compatible With
Sealed central heating systems
Open-vented systems
Combi boiler systems
Steel and copper pipework
Aluminium components
Plastic pipework
Underfloor heating circuits
Key Properties
Inhibits scale formation
Prevents sludge build-up
Corrosion protection
Single treatment per system
Compatible with most heating additives
1 litre per standard system
Not suitable for: Not intended for potable water systems or direct hot water circuits. Not a replacement for a power flush on a heavily contaminated system — clean the system first, then dose.
Add the inhibitor to the system via the feed and expansion tank on open-vented systems, or through a radiator bleed valve or filling loop on sealed systems. One litre is the standard dose for a typical domestic system of up to ten radiators. For larger systems, check the dosing guidance on the label and increase accordingly.
After dosing, run the system up to temperature and circulate for at least an hour to distribute the inhibitor throughout all circuits. Bleed radiators if needed to ensure full flow. On sealed systems, check and restore system pressure to the correct level after dosing, as introducing liquid can slightly affect the reading.
Ensure the system has been flushed and is free from heavy sludge contamination before dosing
For open-vented systems, pour the inhibitor directly into the feed and expansion tank
For sealed systems, introduce via a radiator bleed valve or through the filling loop using an appropriate adaptor
Use one litre for a standard domestic system of up to ten radiators, scaling up for larger systems
Run the heating system at full temperature for a minimum of one hour to distribute the inhibitor
Bleed all radiators to confirm good flow and that the inhibitor has reached every circuit
Check and restore system pressure on sealed systems after dosing
Record the dose date and product used for warranty and service records
How much P14 do I need for a standard home?
One litre covers a typical domestic central heating system with up to around ten radiators. For larger systems or properties with multiple zones, check the dosing rate on the label and add proportionally. It's always worth slightly over-dosing rather than under-dosing on bigger systems.
Can I use Everbuild P14 with other heating additives or leak sealers?
Generally yes. The P14 formula is compatible with most standard central heating additives and leak sealers available in the UK. If you're combining products, add them separately and allow the system to circulate between additions. When in doubt, check with the manufacturer of the other product.
How often does the inhibitor need to be topped up?
In a well-maintained sealed system with minimal water loss, the inhibitor concentration should remain adequate for around 12 months. Open-vented systems, or any system that requires frequent top-ups, can become diluted faster. Use inhibitor test strips at each service visit to check concentration and top up if it's dropped below the recommended level.
Everbuild P14 is a liquid central heating inhibitor formulated to prevent corrosion, scale and sludge in wet central heating systems. It is suitable for use with ferrous and non-ferrous metals including steel, copper and aluminium, as well as plastic pipework and fittings. The product is water-based and compatible with the majority of commercially available heating system treatments.
Brand
Everbuild
Product Code
P14
Volume
1 litre
System Coverage
Up to 10 radiators (standard domestic system)
Compatible Systems
Sealed, open-vented, combi, underfloor heating
Compatible Materials
Steel, copper, aluminium, plastic
Box Quantity
12
Size
1l
Box Quantity
12
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